Simple & Compound Int.- Groups - Rates - Ratios

Question 1

Compound Interest: Semiannual

Answer 1

Divide interest rate in half and apply it every 6 months

Question 2

Compound Interest: Semiannual

Answer 2

Divide interest rate in half and apply it every 6 months

Question 3

Compound Interest: Quarterly

Answer 3

Divide interest rate into 4s and apply every 3 months (every three months is 4 times within a year since 12/3 = 4)

Question 4

Group Formula (and when to use…)

Group problems when you see the words “both or neither”

Answer 4

When you see words like: “both or neither”
Total = g1 + g2 - B + N

g1 = group 1 
g2 = group 2 
B = both 
N = neither

Question 5

Group grid (and when to use…)

Answer 5

When you see worlds like: “either and or”

Question 6

Percent change

Answer 6

Percent change when question about

1. percent increase
2. percent decrease

Percent change = (difference / original) * 100

Percent increase: smaller number is the original value

Percent decrease: larger number is the original value

Phrases: 
Percent more
Percent less
Percent increase 
Percent decrease

Question 7

Ratio

Answer 7

If you see the word ratio on the GRE, check to see if it is asking about the total. If the question is asking about the total, you can solve it like you solve ratio questions. If it is not asking about the total you can set up a proportion

Question 8

Rate Pie

Answer 8

/ distance/ work /
time * rate

think “D T R”

Question 9

Average Pie

How do you know how many times to use an average pie?

Answer 9

/ total /
                    # of things  *   average 

Typically, however many times you see the word “average” in the question is how many average pies you do

Question 10

“of” when translating percent’s

Answer 10

multiply *

Question 11

“percent” when translating percent’s

Answer 11

divide by 100

Question 12

“what” when translating percent’s

Answer 12

variable (x)

Question 13

“is” / “are” / “were” when translating percent’s

Answer 13

equals =

Question 14

.80% is equal to what over 100?

Answer 14

.80/100

Question 15

If you don’t use 100 in a percent example what do you have to do at the end of the problem?

Answer 15

You have to convert it back to a percent which in most cases means you have to multiply it by 100

Question 16

profit = ?

Answer 16

profit = sale price - cost

Question 17

“regular” shape

Answer 17

a shape where all the sides and angles within the shape are all the same

Question 18

formula for knowing the degree of angles within a geometric shape

Answer 18

180(n - 2) where n = the number of sides of the shape.

for example, to solve for a “regular” pentagon you would do 180(5 - 2)

Question 19

When you do what the test writers expect, you don’t get the best score possible!!

Answer 19

do the unexpected!! don’t be predictable

Question 20

0 is even or odd?

Answer 20

even!

Question 21

Divisibility Rules: 2

Answer 21

A number is divisible by 2 if its units digit is even

Question 22

Divisibility rules: 3

Answer 22

sum of digits divisible by 3

Question 23

On January 1, 2015, the balance of an account that pays simple annual interest of 2% is $3, 750. How much money will be in the account on January 1, 2020?

Answer 23

$4,125

Question 24

Val opens a CD with an initial deposit, if the account earns 4% annual interest and no other transactions are made, then what percent of the initial deposit will be paid in interest after two years?

Answer 24

8%

Question 25

$5,000 invested for one year at 6.09% simple annual interest = ?

Answer 25

304.5